CN217305076U - Rapid measurement device for NOx in denitration flue gas - Google Patents

Abstract

The utility model provides a denitration flue gas NOx quick measuring device. Intake pipe, blast pipe have been seted up respectively to the upper and lower both sides in measurement chamber, and intake pipe and blast pipe set up the one side relatively and are linked together with NOx analysis module respectively, and NOx analysis module installs in measuring intracavity portion, and wireless communication module passes through the circuit and is connected with NOx analysis module, and thermoelectric generation module installs in measuring intracavity portion to thermoelectric generation module respectively with wireless communication module, NOx analysis module electric connection. The utility model discloses a to setting up analysis module in the flue to fundamentally avoided measuring numerical value's hysteresis quality, improve and measure the promptness, utilize the environment nature of negative pressure in the flue to form the flow of air, make NOx analysis module and wireless communication module be in suitable operating temperature, supply power for wireless communication module and NOx analysis module through thermoelectric generation module, reduced the work load, installation cost and the running cost of laying power cable and communication cable.

Description

Rapid measurement device for NOx in denitration flue gas

Technical Field

The utility model relates to a NOx measuring device technical field especially relates to denitration flue gas NOx quick measuring device.

Background

The Selective Catalytic Reduction (SCR) flue gas denitration technology is used as a main high-efficiency nitrogen oxide (NOx) control technology and widely applied to a coal-fired generator set; under the background of ultralow emission of flue gas pollutants implemented in the whole industry of the power industry, the SCR denitration efficiency is required to be further improved; in order to obtain ideal nitrogen oxide (NOx) efficiency and ensure that the NH3 escape amount is maintained at a low level, the pollutant NOx in the denitration flue gas needs to be accurately and quickly monitored on line, and ammonia injection is optimally controlled based on monitoring; in the measurement of denitration flue gas, an infrared absorption method is mainly adopted for measuring NOx; the method comprises the steps of measuring the absorption spectrum of laser passing through the flue gas, thereby quantitatively obtaining the NOx component of the flue gas; the measuring equipment based on the method comprises optical and electronic components, and the optical and electronic components generally require the temperature of a working environment not to exceed 80 ℃, otherwise the optical and electronic components can be failed; the temperature of the denitrated flue gas is about 350 ℃, so the conventional technical mode is to install a measurement core component outside a flue, and the high-temperature flue gas is pumped out and then is sent into the measurement core component; in the process that the flue gas is conveyed to the analyzer from the flue through the extraction gas path, NOx in the flue may have changed, so that the numerical value measured by the analyzer has time lag, and the accurate operation of the denitration system is difficult.

Therefore, the rapid measuring device for the denitrated smoke NOx is provided, and the problem of hysteresis occurring in the measuring process is avoided.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a denitration flue gas NOx quick measuring device.

The utility model provides a denitration flue gas NOx quick measuring device, including measuring chamber, intake pipe, blast pipe NOx analysis module, wireless communication module and thermoelectric generation module, intake pipe, blast pipe have been seted up respectively to the upper and lower both sides in measurement chamber, and intake pipe and blast pipe set up the one side relatively and be linked together with NOx analysis module respectively, and NOx analysis module installs in measuring intracavity portion, wireless communication module passes through the circuit and is connected with NOx analysis module, thermoelectric generation module installs in measuring intracavity portion, and thermoelectric generation module hugs closely in measuring intracavity wall to thermoelectric generation module respectively with wireless communication module, NOx analysis module electric connection.

Preferably, the end of the air inlet pipe and the end of the air outlet pipe, which are connected with the measuring cavity, are of a horn-shaped structure.

Preferably, the upper end of the air inlet pipe is opposite to the incoming flow direction of the flue gas.

Preferably, the lower end of the exhaust pipe faces away from the flow direction of the flue gas.

Preferably, one end of the measuring cavity is cylindrical, one end of the measuring cavity is directly communicated with the atmosphere, the other end of the measuring cavity is in a flared closing-in shape, and the other end of the measuring cavity is directly communicated with the flue.

Preferably, the thermoelectric generation module comprises a plurality of units, and the thermoelectric generation modules of the plurality of units are uniformly arranged on the inner wall of the measurement cavity in an annular arrangement manner in the measurement cavity.

Compared with the prior art, the utility model provides a denitration flue gas NOx quick measuring device has following beneficial effect:

the utility model provides a denitration flue gas NOx quick measuring device, through setting up analysis module in the flue, thereby fundamentally avoided measuring numerical value's hysteresis quality, improve and measure the promptness, utilize the environment nature of negative pressure in the flue to form the flow of air, make NOx analysis module and wireless communication module be in suitable operating temperature, utilize the high temperature condition of flue, be wireless communication module and NOx analysis module power supply through thermoelectric generation module, the work load of laying power cable and communication has been reduced, the installation cost and the running cost of reducing means.

Drawings

Fig. 1 is a schematic structural diagram of a measurement cavity provided by the present invention;

fig. 2 is a schematic structural view of the rapid denitration flue gas NOx measurement device provided by the present invention;

fig. 3 is the utility model provides a structural schematic diagram of another angle of denitration flue gas NOx rapid survey device.

Reference numbers in the figures: 1. a measurement cavity; 2. an air inlet pipe; 3. an exhaust pipe; 4. a NOx analysis module; 5. a wireless communication module; 6. and a thermoelectric power generation module.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and embodiments.

Please refer to fig. 1, fig. 2 and fig. 3, wherein fig. 1 is a schematic structural diagram of a measurement cavity according to the present invention; fig. 2 is a schematic structural view of the rapid denitration flue gas NOx measurement device provided by the present invention; fig. 3 is the utility model provides a denitration flue gas NOx rapid survey device another angle's schematic structure diagram. The method comprises the following steps: the device comprises a measurement cavity 1, an air inlet pipe 2, an exhaust pipe 3, a NOx analysis module 4, a wireless communication module 5 and a temperature difference power generation module 6.

In the specific implementation process, as shown in fig. 1 and fig. 2, an air inlet pipe 2 and an air outlet pipe 3 are respectively arranged at the upper side and the lower side of a measurement cavity 1, the air inlet pipe 2 and the air outlet pipe 3 are arranged opposite to each other and are respectively communicated with a NOx analysis module 4, the NOx analysis module 4 is arranged in the measurement cavity 1, the measurement cavity 1 is arranged in a denitration flue, a wireless communication module 5 is connected with the NOx analysis module 4 through a circuit, a thermoelectric generation module 6 is arranged in the measurement cavity 1, the thermoelectric generation module 6 is tightly attached to the inner wall of the measurement cavity, the thermoelectric generation module 6 is respectively electrically connected with the wireless communication module 5 and the NOx analysis module 4, the air inlet pipe 2 and the air outlet pipe 3 are connected with the measurement cavity 1, one end of the air inlet pipe 2 and the air outlet pipe 3 is in a horn-shaped structure, the upper end of the air inlet pipe 2 is opposite to the incoming flow direction of flue gas, the lower end of the air outlet pipe 3 is opposite to the flow direction of the flue gas, the wireless communication module 5 is used for wirelessly communicating the value and the working state measured by the NOx analysis module 4, the smoke is transmitted to a remote server (DCS system), no communication cable is required to be additionally laid, the installation cost is reduced, the reliability of the device is improved, a temperature difference power generation module 6 is installed inside a measurement cavity 1, the temperature difference power generation module 6 is close to the inner wall of the measurement cavity 1, the temperature difference power generation module 6 is respectively electrically connected with a wireless communication module 5 and a NOx analysis module 4, one end of the measurement cavity 1 is cylindrical, one end of the measurement cavity 1 is directly communicated with the atmosphere, the other end of one end of the measurement cavity 1 is flared and closed, the other end of the measurement cavity 1 is directly communicated with a flue, high-temperature smoke in the flue enters the NOx analysis module 4 along one end of an air inlet pipe 2, after the NOx analysis module 4 completes analysis and measurement, the high-temperature smoke flows to the flue from an exhaust pipe 3, the whole flowing process of the measured smoke depends on the flowing inertia of the smoke, no extra power input is required, the reliability is improved, and the pressure in the flue is lower than the atmospheric pressure (negative pressure), outside air flows in through one side of the measurement cavity 1, cools the wireless communication module 5 and the NOx analysis module 4 in sequence, and finally enters the flue from the other side of the measurement cavity 1. Due to continuous and stable air flow, the wireless communication module 5 and the NOx analysis module 4 are still at proper ambient temperature although the measurement cavity 1 is positioned in the flue, and the trumpet-shaped closing-in achieves the effects of reducing flow resistance, improving flow speed and improving flow uniformity, so that the air cooling effect is ensured.

Referring to fig. 1 and 2, thermoelectric generation module 6 comprises a plurality of units, and thermoelectric generation module 6 of a plurality of units is in the mode of measuring chamber 1 with the annular arrangement, evenly install on measuring chamber 1 inner wall, thermoelectric generation module 6 is through the high temperature that measuring chamber 1 avoided, measure the difference in temperature between the inside normal atmospheric temperature in chamber 1, generate electricity, and carry out power supply for wireless communication module 5 and NOx analysis module 4, need not lay supply cable in addition, installation cost has been reduced.

The utility model provides a theory of operation as follows: under the following conditions, the pressure in the flue is-2500 Pa (relative pressure), the temperature is 350 ℃, the flow rate of flue gas is 10m/s, the temperature of outside air is 40 ℃, and simulation calculation is carried out: the flow velocity of the flue gas of the gas inlet pipe 2 and the gas outlet pipe 3 is 8 m/s; the flow velocity of the air in the measuring cavity 1 reaches 13.5m/s, so that the requirement of NOx analysis and measurement is met; when the surface temperature of the NOx analysis module 4 does not exceed 50 ℃, the working environment is stable; the actual temperature difference available for the temperature difference power generation module 6 is 300 ℃, 10 units are adopted for power generation, the generated power is about 10 × 5 to 50W, and the electric energy requirement required by the system is met.

The whole device has low installation cost and no lag in measurement. Reliable and timely measurement data are provided for accurate control of the denitration ammonia injection system.

The utility model discloses the NOx analysis module 4 that relates to in adopt siemens ULTRAMAT23(U23) nitrogen oxide analysis module, wireless communication module 5, thermoelectric generation module 6, circuit and control to be prior art, do not carry out too much repetitious description here.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.

Claims (6)

1. Denitration flue gas NOx quick measuring device, including measuring chamber (1), intake pipe (2), blast pipe (3) NOx analysis module (4), wireless communication module (5) and thermoelectric generation module (6), its characterized in that: intake pipe (2), blast pipe (3) have been seted up respectively to measurement chamber (1) upper and lower both sides, and intake pipe (2) set up the one side with blast pipe (3) relatively and be linked together with NOx analysis module (4) respectively, and NOx analysis module (4) are installed inside measuring chamber (1), wireless communication module (5) are connected with NOx analysis module (4) through the circuit, thermoelectric generation module (6) are installed inside measuring chamber (1), and thermoelectric generation module (6) hug closely in measuring intracavity wall to thermoelectric generation module (6) respectively with wireless communication module (5), NOx analysis module (4) electric connection.

2. The denitration flue gas NOx rapid measuring device of claim 1, characterized in that the inlet pipe (2) and the exhaust pipe (3) are connected with the measuring cavity (1) and one end of the inlet pipe and one end of the exhaust pipe are in a horn-shaped structure.

3. The rapid denitration flue gas NOx measuring device of claim 1, wherein the upper end of the air inlet pipe (2) is over against the incoming flow direction of flue gas.

4. The rapid denitration flue gas NOx measuring device according to claim 1, wherein the lower end of the exhaust pipe (3) faces away from the flow direction of flue gas.

5. The denitration flue gas NOx rapid measuring device according to claim 1, wherein one end of the measuring cavity (1) is cylindrical, one end of the measuring cavity (1) is directly communicated with the atmosphere, the other end of the measuring cavity (1) is a flared closing-in, and the other end of the measuring cavity (1) is directly communicated with the flue.

6. The rapid denitration flue gas NOx measuring device according to claim 1, wherein the thermoelectric generation module (6) is composed of a plurality of units, and the thermoelectric generation modules (6) of the plurality of units are uniformly arranged on the inner wall of the measuring cavity (1) in an annular arrangement mode in the measuring cavity (1).

Images